Migrate to NavKey

The `Screen` sealed class now implements the `NavKey` interface from the navigation library and is marked as `@Serializable`. This change removes the manual `remember { mutableStateListOf<Screen>(PopularMovies) }` in favor of a new `rememberNavBackStack` composable function, which utilizes `rememberSerializable` with a `NavBackStackSerializer` for better state restoration.

Author: LordRaydenMK

app/src/main/java/io/github/lordraydenmk/themoviedbapp/MoviesApp.kt

@@ -1,33 +1,44 @@
 package io.github.lordraydenmk.themoviedbapp
 
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.mutableStateListOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.snapshots.SnapshotStateList
+import androidx.compose.runtime.saveable.rememberSerializable
 import androidx.lifecycle.viewmodel.navigation3.rememberViewModelStoreNavEntryDecorator
+import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.NavEntry
+import androidx.navigation3.runtime.NavKey
 import androidx.navigation3.runtime.rememberSaveableStateHolderNavEntryDecorator
+import androidx.navigation3.runtime.serialization.NavBackStackSerializer
+import androidx.navigation3.runtime.serialization.NavKeySerializer
 import androidx.navigation3.ui.NavDisplay
 import io.github.lordraydenmk.themoviedbapp.movies.Screen
 import io.github.lordraydenmk.themoviedbapp.movies.Screen.MovieDetails
 import io.github.lordraydenmk.themoviedbapp.movies.Screen.PopularMovies
 import io.github.lordraydenmk.themoviedbapp.movies.moviedetails.MovieDetailsNavScreen
 import io.github.lordraydenmk.themoviedbapp.movies.popularmovies.MoviesNavScreen
 
-typealias BackStack = SnapshotStateList<Screen>
+typealias BackStack = NavBackStack<Screen>
 
 @Composable
-fun MoviesApplication(appModule: AppModule) {
-    val backStack = remember { mutableStateListOf<Screen>(PopularMovies) }
+fun <T : NavKey> rememberNavBackStack(vararg elements: NavKey): NavBackStack<T> {
+    return rememberSerializable(
+        serializer = NavBackStackSerializer(elementSerializer = NavKeySerializer())
+    ) {
+        @Suppress("UNCHECKED_CAST")
+        NavBackStack(*elements) as NavBackStack<T>
+    }
+}
 
+@Composable
+fun MoviesApplication(appModule: AppModule) {
+    val backStack = rememberNavBackStack<Screen>(PopularMovies)
     NavDisplay(
         entryDecorators = listOf(
             rememberSaveableStateHolderNavEntryDecorator(),
             rememberViewModelStoreNavEntryDecorator()
         ),
         backStack = backStack,
         onBack = { backStack.removeLastOrNull() },
-        entryProvider = { key: Screen ->
+        entryProvider = { key ->
             when (key) {
                 PopularMovies -> NavEntry(key) {
                     MoviesNavScreen(appModule, backStack)

app/src/main/java/io/github/lordraydenmk/themoviedbapp/movies/Screen.kt

@@ -1,8 +1,14 @@
 package io.github.lordraydenmk.themoviedbapp.movies
 
+import androidx.navigation3.runtime.NavKey
 import io.github.lordraydenmk.themoviedbapp.movies.domain.MovieId
+import kotlinx.serialization.Serializable
 
-sealed class Screen {
+@Serializable
+sealed class Screen : NavKey {
+    @Serializable
     data object PopularMovies : Screen()
+
+    @Serializable
     data class MovieDetails(val movieId: MovieId) : Screen()
 }